I love how manufactures sneak "HD" into marketing just about anything these days... any lens mounted on a modern DSLR is above and beyond an "HD" lens.
The truth is in the optical coating. And yes they included a removable hood. For me sticking with crop a tad longer but eventually having FF later this lens will stick with me for a long time.
Really it's no different with Canon or Nikon, they will release a version II and sometimes it's just optical coatings to help flare and corner sharpness. To my understanding this "HD" version of this 8mm has better coatings to help fight flare and CA which I've read can be pretty bad sometimes.
And I only paid 299 new, compared to the average price of the first version of 265 new or 200-230 used I was OK spending a little bit more... I mean why not?... drop in a bucket really.











